A galaxy is observed to recede at speed 140 km/s. If the Hubble constant is 70 km/s/ Mpc, how far is the galaxy?

Q: If a quasar has a recessional velocity of 2.7 × 10 5 km/sec and is determined to be 3600 Mpc, what…

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Q: Using 22 km/s/million light-years for Hubble’s constant, what recessional velocity do we expect to…

A: Given  Hubble's constant , H = 22 km/s/ million light years. Distance of galaxy , d = 600 million…

Q: Estimate the age of the universe for a Hubble constant of (a)50km/s/Mpc, (b) 75km/s/Mpc, and (c) 100…

A: The Hubble time is t = 1/H0 . For each value of Ho, we have: a). t = 6.18 × 10¹⁷ s = 1.96 × 1010 yrs…

Q: e gravitational energy of a pair of colliding galaxies , each of mass 10 Mo separated by a distance…

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Q: Describe a quasar.

A: Quasar is an extremely luminous active galactic nucleus. inside quasar there is a supermassive black…

Q: how do deep images by the Hubble Space Telescope confirm the bottom-up theory of galaxy formation?

A: The bottom up model, also known as Hierarchal Clustering s the most accepted way for galaxy…

Q: what is the difference between a Sa and a Sb galaxy? Between a SBb and a Sb?

A: Galaxy morphological classification is formed by the division of the galaxies into groups on the…

Q: Galaxy will emit synchrotron radiation as a sun forms

A: The star forming region of a Spiral Galaxy will emit synchrotron radiation as a sun forms in the…

Q: What Hubble constant corresponds to an approximate age of the universe of 1010 y? To get an…

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Q: Recall that Hubbleʹs law is written v = H0d, where v is the recession velocity of a galaxy located a…

A: Data provided: H0 = 80 km/Mpc Distance (d) = 800 Mpc Required: Velocity of the galaxy (v)

Q: why are the shells visible around some elliptical galaxies significant?

A: The shell structures in the elliptical galaxies indicates the extremely low surface brightness and…

Q: A black hole (m = 2.90 x 10^9 Ms) sits in the middle of the M87 galaxy. Calculate its gravitational…

A: mass of black hole = 2.90×109 MsMs = 1.99×1030 kg

Q: Is a quasar with a redshift of z = 2 going faster than the speed of light? Why or why not?

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Q: If a galaxy has an apparent radial velocity of 2,319 km/s and the Hubble constant is 70 km/s/Mpc,…

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Q: How do we know there are supermassive black holes driving active galaxies?   a. The cores fluctuate…

A: In this problem, The given data- How do we know there are supermassive black holes driving active…

Q: If a galaxy is 100,000,000 parces away and has absolute magnitude of -20.0 what is the galaxies…

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Q: What is the ratio of the distance to the nearest galaxy to the size of the Milky Way galaxy? This is…

A: Given information: The diameter of the milky way (dMW) = 1021 m The distance of the nearest galaxy…

Q: A star at a distance of 50000 light years from the center of a galaxy has an orbital speed of 100…

A: Distance of the star from the center of the galaxy, r = 50000 ly The orbital speed of the star, v =…

Q: A star near the visible edge of a galaxy travels in a uniform circular orbit. It is 43,500 ly…

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Q: If a galaxy is 18 Mpc from Earth and the Hubble constant is 70 km/s/Mpc, what is the recession…

A: Answer:-  Answer (1)  Given  Distance (d) = 18 Mpc  Hubble constant (Ho) = 70 km/s/Mpc  Velocity of…

Q: Identify a feature of the Whirlpool Galaxy that is visible in all several types of light. Explain…

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Q: What type of galaxy is NCG 1317? a. E5 b. SBa c. S0 d. Sa

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Q: Processes at the center of a nearby galaxy cause the emission of electromagnetic radiation at a…

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Q: A galaxy's velocity is measured to be 3112 kilometers per second away from us. What is the distance…

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Q: In the reading, you were told that there were roughly 10,000 galaxies in the image of the Hubble…

A: Given:  one image of hubble ultra deep field is roughly 10 square arcminutes.  Number of galaxies in…

Q: The red-shift of a galaxy observed by us corresponds to a speed of 50000 km/s. How far is the galaxy…

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Q: What is Hubble constant?

A: Introduction: Hubble constant is the constant of proportionality of the relative velocity of the…

Q: Suppose you have obtained spectra of several galaxies and have measuerd the observed wavelength of…

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Q: If astronomers find they have made a mistake and our Solar System is actually 7,350 pc rather than…

A: In the given question, We have to determine the mass of the galaxy within the orbit of the sun.

Q: The Hubble Law, equation (D), can be used to determine the age of the universe. Using your average…

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Q: If a galaxy has a radial velocity of 21,641 km/s, what is its expected distance from the Hubble Law?…

A: Given data :  Radial velocity of galaxy (V) = 21,641 km/s Humble constant (Ho) = 71 km/s/Mpc…

Q: what is the difference between an E0 galaxy and an E1 galaxy?

A: An elliptical galaxy has approximately ellipsoidal shape and a smooth, nearly featureless image.…

Q: What is the estimated age of the Universe (in years) if the Hubble constant is 60 km/s/Mpc?

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Stellar evolution

We may see thousands of stars in the dark sky. Our universe consists of billions of stars. Stars may appear tiny to us but they are huge balls of gasses. Sun is a star of average size. Some stars are even a thousand times larger than the sun. The stars do not exist forever they have a certain lifetime. The life span of the sun is about 10 billion years. The star undergoes various changes during its lifetime, this process is called stellar evolution. The structure of the sun-like star is shown below.

Red Shift

It is an astronomical phenomenon. In this phenomenon, increase in wavelength with corresponding decrease in photon energy and frequency of radiation of light. It is the displacement of spectrum of any kind of astronomical object to the longer wavelengths (red) side.